US3897120A - Tiltable converter self-aligning bearing - Google Patents

Tiltable converter self-aligning bearing Download PDF

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Publication number
US3897120A
US3897120A US411456A US41145673A US3897120A US 3897120 A US3897120 A US 3897120A US 411456 A US411456 A US 411456A US 41145673 A US41145673 A US 41145673A US 3897120 A US3897120 A US 3897120A
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US
United States
Prior art keywords
trunnion
bearing
spacer ring
parts
ring
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US411456A
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English (en)
Inventor
Ernst Riegler
Manfred Schmidt
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Voestalpine AG
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Voestalpine AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4633—Supporting means
    • C21C5/464—Trunnion bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
    • F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00—Application independent of particular apparatuses
    • F16C2300/10—Application independent of particular apparatuses related to size
    • F16C2300/14—Large applications, e.g. bearings having an inner diameter exceeding 500 mm

Definitions

  • ABSTRACT A bearing construction for carrying trunnions of a tiltable converter comprising a bearing capable of absorbing angular (sagging) and drunken (wobbling) movements and fixed in position by means of two spacer rings which are each secured to the carrying trunnion on the sides of the inner ring of said bearing.
  • At least one of said two spacer rings is made of three parts, namely of two spacer ring parts apposed to the inner ring of the bearing and to the carrying trunnion to be opposed to each other with play, and of a ring surrounding said two spacer ring parts closely.
  • the inner faces of the spacer ring parts have the shape of a truncated cone and coact with the surface of the carrying trunnion which likewise has the shape of a truncated cone whose corresponding inclination extends inwardly towards the bearing centre.
  • FIG-i5 PRIOR ART TILTABLE CONVERTER SELF-ALIGNING BEARING
  • the invention relates to a bearing construction for carrying trunnions of a tiltable converter comprising a bearing capable of absorbing angular (sagging) and drunken (wobbling) movements and fixed in position by means of spacer rings secured to the carrying trunnion on both sides of its inner ring and annular sealing means of plastic material, rubber and the like for sealing the bearing housing.
  • the term bearing is meant to refer to slide-articulation or roller bearings.
  • Converter bearings which have to accommodate loads ofe.g. 600 to 1000 mt (metric tons) must be constructed with great care.
  • a satisfactory bearing construction which, when the carrying trunnions are positioned obliquely owing to the influence of heat, can also take up angular and drunken (wobbling) movements, and in which one of the bearings is designed as movable bearing for accommodating an axial displacement of the carrying trunnion and the other bearing is designed as fixed bearing is described in Austrian Pat. No. 274,870.
  • the carrying trunnions which are secured to the carrying ring on which the converter is supported, have a relatively great diameter. According to the load to be received, the diameter lies between 700 and 1000 mm and may be even greater.
  • converter bearings have only a small number of revolutions of about 1 rpm, highest demands are placed on them owing to the specific operational conditions when they are exposed to heat and dust, in particular with regard to their operational safety.
  • the bearings cease to function, the whole steel production comes to a standstill.
  • a trunnion seat which is composed ofa sealing line inserted into a groove surrounding the trunnion.
  • the groove is formed of two section rings which may be drawn towards each other in an axial direction, and these section rings together with the sealing line are radially displaceable within an annular recess of the bearing housing or a bearing cover, respectively, so that even when the carrying trunnion makes a drunken movement the sealing effect is maintained.
  • the invention is aimed at creating an improved bearis prolonged.
  • the invention resides in that at least one of the two spacer rings is made of three parts, i.e.. of two spacer ring parts which are apposed to the inner ring of the slide-articulation or roller bearing and to the carrying trunnion and are opposed to each other with play, and a ring which surrounds them closely, the inner faces of these spacer ring parts being truncatedcone-shaped and coacting with the carrying trunnion having an inwardly truncated cone-shaped surface area with a corresponding inclination.
  • the inclination angle of the truncated cone-shaped surface area to the carrying trunnion axis preferably amounts to 2 to 4.
  • the spacer ring parts which are designed to be about semicircular, may be rigidly surrounded by providing them with a cylindrical surface upon which surface the ring surrounding them is shrinked on in warm condition, or by designing the ring surrounding the spacer ring parts of two parts which are opposed to each other with a play and may be tightened towards each other by means of screws.
  • the bearing is sealed in that between the spacer rings and lateral, annular covers of the bearing housing spherical sealing faces are arranged with sealings arranged in between in annular recesses, the common central point of the spherical sealing faces being in the central point of the slidearticulation or roller bearing.
  • the combination of the novel arrangement for securing the spacer rings with the novel kind of sealing offers a particularly safe bearing construction for the requirements in steel working operation.
  • This bearing construction is advantageously designed as fixed bearing. It may, however, be applied for movable bearings, in which case the total bearing construction must in addition be displaceable in axial direction of the carrying trunnions, e.g. by abutment on a roller path or by mounting the bearing on a pendulum support.
  • FIG. 1 is a lateral view of a converter plant with its drive.
  • FIG. 2 is a longitudinal sectional view of a bearing construction on the fixed bearing side
  • FIG. 3 shows in enlarged scale a longitudinal sectional view of the securing arrangement of the spacer ring
  • FIG. 4 shows a vertical sectional view along the line IV-IV of FIG. 3.
  • FIG. 5 shows a securing arrangement for a spacer ring as known in the art in the same representation and in the same scale as FIG. 2, and is to facilitate comparison on the one hand and should serve for a better understanding of the invention on the other hand.
  • FIGS. 6 and 7 show modified embodiments in similar representations as FIGS. 3 and 4.
  • numeral 1 denotes a converter which is surrounded by a carrying ring 2 and tiltably supported by means of carrying trunnions 3,4 in a fixed bearing 5 and a movable bearing 6.
  • the fixed bearing 5 and the movable bearing 6 are mounted on stanchions 7 and 8.
  • a slip-on-drive 9 for tilting the converter 1 is fixed on the carrying trunnion 3, which is fixed by a torque support 10 in circumferential direction.
  • numeral 11 denotes a self-aligning roller bearing. It may also be a slide-articulation bearing or a barrel bearing, taper roller bearing or the like, as described eg in the German utility model No. 7,139,476 or in previously mentioned Austrian Pat. No. 274,870.
  • These bearings comprise an inner ring which is secured to the carrying trunnion, and an outer ring which is fixed in the bearing housing. Between inner ring and outer ring the slide or roller bodies are arranged which render it possible for the bearing to take up angular and drunken movements. If such a bearing is designed as a movable bearing, it also has to accommodate axial movements.
  • either its outer ring may be mounted in a slide bushing which is displaceable relative to the fixed bearing housing (cf. Austrian Pat. No. 274,870) or the entire bearing construction may be displaceable in a horizontal direction.
  • the inner ring of the bearing 11 is fixed in position by two spacer rings 12,13.
  • the outer ring is fixed in a housing cover 14, which is releasably connected with a bearing foot. not shown.
  • spherical sealing faces 19 are provided with annular sealings of plastic material, rubber or the like which are inserted in corresponding recesses. These sealings 20,21 may e.g. be O-rings which are able to withstand operational temperatures of up to about 150C.
  • the spherical sealing faces 19 with the radius R have a common central point M which coincides with the central point of the roller bearing 11.
  • the spacer rings 12,13 with their flange-shaped studs 15,16 and the sealings 20,21 may be displaced relative to the lateral housing covers 17,18.
  • the elastic sealings 20,21 are not subjected to any additional pressure strain in a radial direction.
  • the spherical faces 19 are dimensioned sufficiently broad that corresponding to the angular deviation in any oblique position, the sealing effect between the studs 15,16 and the housing covers 17,18 remains intact and no dirt may enter into the bearing interior.
  • the sealings 20,21 are subjected only to a tangential stress so that their life is essentially increased. When necessary they may easily be exchanged after releasing the housing covers 17,18.
  • the bearing inner ring is fixed in position by the left spacer ring 12, which is apposed to the collar 22 of the carrying trunnion 3, and by the right spacer ring 13, which in its turn is composed of the parts 23,24 and 25.
  • the parts 23,24 are the spacer ring parts proper, which are rigidly apposed to the inner ring of the bearing 11, on the one hand, and to the bearing trunnion 3, on the other hand.
  • the parts 23,24 are about semicircular. They are opposed to each other and lie around the bearing trunnion 3 with play 26 and have an L-shaped cross section.
  • the ring 25 consists of one part and is shrunk on in hot condition. It surrounds the semicircular parts 23,24 and holds them closely together.
  • the inner faces of the semicircular parts 23,24 have the shape of a truncated cone and coact with the surface 27 of the carrying trunnion having the shape of a truncated cone with a corresponding inclination. The inclination extends from the outside to the interior, i.e., the trunnion radius 28 situated more to the outside is greater than the radius 29 situated more to the inside.
  • the inclination angle of the surface 27 having the shape of a truncated cone to the carrying trunnion axis is denoted with B and amounts to about 4.
  • the spacer ring parts 23,24 are self- Iockingly secured to the carrying trunnion.
  • the spacer ring parts 23,24 are safely fixed to be indisplaceable in axial direction, and the roller bearing 11 is excellently fixed in axial direction.
  • An axial thrust created by this bearing 11 is absorbed by the surface 27 having a truncated cone shape or by the ring 25, respectively.
  • the ring 25 is likewise designed to be L-shaped. It is connected with the annular stud l6, e.g. by a welding seam 30.
  • FIG. 5 shows a spacer ring fixation of customary type.
  • the right spacer ring 13 is designed in one part and supports itself against a further holding ring 31 which is designed in two parts in circumferential direction.
  • the holding ring 31 is fitted in a groove-shaped recess 32 and abuts against the shoulder-shaped stud 33 of the carrying trunnion.
  • the holding ring 31 is fixed to the spacer ring 13 by means of screws.
  • the disadvantage arising from this known way of securing the spacer ring to the trunnion lies in the fact that the groove shaped recess has to be relatively deep and thus the trunnion is weakened. If, e.g.
  • the trunnion diameter D amounts to 1000 mm in the bearing area
  • the diameter D amounts to 970 mm in the area of the spacer ring
  • the diameter D amounts to 960 mm outside the bearing 5
  • the diameter D amounts to 800 mm in the area of the slip-on-drive
  • the diameter D amounts thus to 820 mm at the deepest place of the groove-shaped recess.
  • the difference D -D thus amounts to mm; owing to this deep incision a notch effect will be obtained so that when the tensions in the carrying trunnion 3 are calculated, it becomes necessary to add a sufficiently great safety margin for the remaining trunnion diameters.
  • the difference D -D mm the difference D -D mm.
  • FIGS. 6 and 7 illustrate a modified embodiment of the invention.
  • a securing ring is provided which comprises the ring parts 34,35, which are opposed to each other with play 36.
  • screws 38 which are inserted in recesses 37, they may be tightened to the spacer ring parts 23,24. Thus, they may be re-used after an exchange of bearing.
  • all joints present owing to the play 26 or 36, respectively, are sealed in axial direction by pressing in a further sealing means, e.g. a string of asbestos.
  • a support arrangement for a tiltable converter comprising a plurality of trunnions secured to the converter and a plurality of bearing assemblies that mount and support the trunnions, each bearing assembly mounting a different trunnion and at least one of the bearing assemblies including:
  • a bearing adapted to accommodate angular and wobbling movements of one of the trunnions and having an inner ring encircling said one trunnion and an outer ring encircling the inner ring; b. two spacer ring assemblies encircling said one trunnion and located adjacent different ends of the inner ring of the bearing to maintain the inner ring in position axially of said one trunnion; c. a bearing housing encircling the bearing and including annular portions that depend radially inwardly adjacent each end of the bearing; and d. annular resilient means for sealing the bearing housing, at least one of the spacer ring assemblies including i.
  • two arcuate spacer ring parts that have complementary circumferential extents and are juxtaposed with the inner ring of the bearing and with said one trunnion, the two spacer ring parts being disposed opposite each other about said one trunnion so that adjacent ends of the two spacer ring parts are spaced apart circumferentially of said one trunnion from each other, and
  • a retaining ring that closely encircles the two spacer ring parts, the outer circumferential surface of said one trunnion in a region adjacent said spacer ring parts having a conical shape and the inner circumferential surfaces of the spacer ring parts having complementary, conical shapes so that the conical surfaces of the spacer ring parts cooperate with the conical surface of said one trunnion to maintain said at least one spacer ring assembly in position axially of said one trunnion.
  • sealing means is fabricated of rubber.
  • each spacer ring part has an outer surface shaped as portion .of a cylinder and wherein the retaining ring is shrink fitted onto the spacer ring parts.
  • the retaining ring comprises (a) two separable parts which have complementary circumferential extents and which are disposed opposite each other about said one trunnion so that adjacent ends of said retaining ring parts are spaced apart circumferentially of said one trunnion from each other, and (b) screw means for coupling said parts of the retaining ring together and for tightening the fit of said two parts of the retaining ring about the two' spacer ring parts.
  • a support arrangement according to claim 1. wherein the spacer ring assemblies and the depending portions of the bearing housing have complementary spherical sealing surfaces, all of which surfaces being generated from a common center point that is located adjacent the center of the bearing, and wherein the sealing means including two annular seal members disposed in annular recesses that are formed at least one in a spherical sealingsurface adjacent each end of the bearing so that the seal members seal joints defined at interfaces between the spherical surfaces of the depending housing portions and of the spacer ring assemblies.
  • a support arrangement for a tiltable converter comprising a plurality of trunnions secured to the converter and a plurality of bearing assemblies that mount and support the trunnions, each bearing assembly mounting a different trunnion and at least one of the bearing assemblies including:
  • a bearing adapted to accommodate angular and wobbling movements of one of the trunnions and having an inner ring encircling said one trunnion;
  • two spacer ring assemblies encircling said one trunnion and located adjacent different ends of the inner ring of the bearing to maintain the inner ring in position axially-of said one trunnion, at least one of the spacer ring-assemblies including:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Support Of The Bearing (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Sealing Devices (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
US411456A 1973-01-30 1973-10-31 Tiltable converter self-aligning bearing Expired - Lifetime US3897120A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT77773A AT338846B (de) 1973-01-30 1973-01-30 Lagerkonstruktion fur tragzapfen eines kippbaren konverters

Publications (1)

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US3897120A true US3897120A (en) 1975-07-29

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US411456A Expired - Lifetime US3897120A (en) 1973-01-30 1973-10-31 Tiltable converter self-aligning bearing

Country Status (12)

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US (1) US3897120A (ja)
JP (1) JPS5131083B2 (ja)
AT (1) AT338846B (ja)
BE (1) BE806927A (ja)
CA (1) CA994843A (ja)
CS (1) CS187402B2 (ja)
DE (1) DE2349429B2 (ja)
FR (1) FR2215472B1 (ja)
GB (1) GB1440982A (ja)
IT (1) IT993946B (ja)
LU (1) LU68726A1 (ja)
SE (1) SE382642B (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948576A (en) * 1974-04-05 1976-04-06 Nereinigte Osterreichische Eisen- Und Stahlwerk - Alpine Montan Aktiengesellschaft Expansion bearing assembly for a converter carrying trunnion
US3951390A (en) * 1974-04-03 1976-04-20 Pennsylvania Engineering Corporation Thrust bearing device for metal treating vessel
US4588310A (en) * 1983-06-15 1986-05-13 Kupczik Guenter Bearing arrangement to be submerged in water or a slurry
US5002406A (en) * 1990-02-20 1991-03-26 Emerson Electric Co. Sealing structure for a spherical bearing assembly
CN109290563A (zh) * 2018-11-27 2019-02-01 瓦房店轴承集团国家轴承工程技术研究中心有限公司 钢包倾动装置配套用剖分定距套
US10323685B2 (en) * 2017-07-21 2019-06-18 Aktiebolaget Skf Bearing arrangement for a tiltable converter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT222924Z2 (it) * 1991-03-01 1995-05-09 Skf Ind Spa Gruppo di supporto per un elemento folle, in particolare una ruota nonmotrice di un veicolo
FR2681269B1 (fr) * 1991-09-13 1995-11-17 Lorraine Laminage Dispositif d'articulation pour le basculement d'une enceinte, notamment une poche de coulee de metal liquide.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2149712A (en) * 1935-04-02 1939-03-07 Nomy Ab Bearing
US3427081A (en) * 1967-07-10 1969-02-11 Universal American Corp Bearing assembly
US3523714A (en) * 1966-10-11 1970-08-11 Voest Ag Bearing arrangement for tiltable crucibles or converters
US3588201A (en) * 1969-09-05 1971-06-28 Roller Bearing Co Of America Sealed self-aligning plain bearing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2149712A (en) * 1935-04-02 1939-03-07 Nomy Ab Bearing
US3523714A (en) * 1966-10-11 1970-08-11 Voest Ag Bearing arrangement for tiltable crucibles or converters
US3427081A (en) * 1967-07-10 1969-02-11 Universal American Corp Bearing assembly
US3588201A (en) * 1969-09-05 1971-06-28 Roller Bearing Co Of America Sealed self-aligning plain bearing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951390A (en) * 1974-04-03 1976-04-20 Pennsylvania Engineering Corporation Thrust bearing device for metal treating vessel
US3948576A (en) * 1974-04-05 1976-04-06 Nereinigte Osterreichische Eisen- Und Stahlwerk - Alpine Montan Aktiengesellschaft Expansion bearing assembly for a converter carrying trunnion
US4588310A (en) * 1983-06-15 1986-05-13 Kupczik Guenter Bearing arrangement to be submerged in water or a slurry
US5002406A (en) * 1990-02-20 1991-03-26 Emerson Electric Co. Sealing structure for a spherical bearing assembly
US10323685B2 (en) * 2017-07-21 2019-06-18 Aktiebolaget Skf Bearing arrangement for a tiltable converter
CN109290563A (zh) * 2018-11-27 2019-02-01 瓦房店轴承集团国家轴承工程技术研究中心有限公司 钢包倾动装置配套用剖分定距套
CN109290563B (zh) * 2018-11-27 2024-04-12 瓦房店轴承集团国家轴承工程技术研究中心有限公司 钢包倾动装置配套用剖分定距套

Also Published As

Publication number Publication date
DE2349429A1 (de) 1974-08-01
DE2349429B2 (de) 1978-06-29
FR2215472A1 (ja) 1974-08-23
IT993946B (it) 1975-09-30
AT338846B (de) 1977-09-12
JPS49105706A (ja) 1974-10-07
BE806927A (fr) 1974-03-01
ATA77773A (de) 1977-01-15
SE382642B (sv) 1976-02-09
CA994843A (en) 1976-08-10
FR2215472B1 (ja) 1976-10-01
AU6086673A (en) 1975-04-10
JPS5131083B2 (ja) 1976-09-04
GB1440982A (en) 1976-06-30
LU68726A1 (ja) 1974-01-08
CS187402B2 (en) 1979-01-31

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